JP3327010B2 - Power converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power converter for obtaining AC power from a DC power supply, and more particularly to a power converter for obtaining AC power using a switched capacitor.

[0002]

2. Description of the Related Art Japanese Patent Application No. 6-24974 discloses a circuit for obtaining an AC output from a DC power supply using a switched capacitor.
FIG. 9 shows a circuit diagram and FIG. 10 shows an operation waveform diagram.

In this circuit, capacitance elements C _{1 to} C ₅ are connected to a voltage V ₁₀ from a DC power supply E via an inductance element L _1.
The load Z and the load capacitance element Cz are charged to different voltages in a voltage relationship of <V ₂₀ <V ₃₀ <V ₄₀ <V _{50 and} the polarity is inverted by the switching elements S _{z1 to} S _z4 and the switching elements S _{z1 to} S _z4. To the load circuit 1 composed of the capacitance elements C ₁ to C ₁ through the inductance element L _2.
By connecting the C ₅ sequentially, with smoothly varying the voltage across (load voltage) Vz of the load Z is intended to reduce the distortion of the load voltage Vz, small inductance element L _1, the inductance element L ₂ The power transmission efficiency is improved by transmitting power in a resonant manner through the power supply.

[0004]

In the prior art, the switching element S _n1 is turned on and off at the timing when the current flowing through the inductance element L ₁ and the capacitance element C _n1 resonates and crosses zero.
Counter electromotive force is prevented from occurring in the inductance element L _1. Here, when supplying a high-frequency AC voltage to a load, charging of the capacitance element C ₁ -C ₅ must be carried out in a period shorter than the AC cycle of the high frequency alternating voltage.
However, along with shortening the AC cycle of the high-frequency AC voltage by setting a small value of the inductance element L _1, the switching element S _n1 at the timing of zero-crossing
Is difficult to turn on and off.

The present invention has been made in view of the above problems, and an object of the present invention is to use a switched capacitor which prevents deterioration of a switching element, has high circuit efficiency, and has low input distortion. An object of the present invention is to provide a power conversion device.

[0006]

According to the present invention, a load, a plurality of power supply capacitance elements, a first inductance element connected to a DC power supply, and the first inductance element are provided. Charging means for charging the plurality of power supply capacitance elements to a substantially predetermined voltage via a load, a load capacitance element connected in parallel to the load , and a parallel circuit of the load and the load capacitance element. A second inductance element connected in series, a plurality of switching elements connected in series between the series circuit including the parallel circuit and the second inductance element, and the plurality of power supply capacitance elements; The power supply capacitance element is selectively switched and connected to the series circuit .
The load capacitance via an inductance element
Control means for changing the voltage across the load capacitance element in a substantially pulsating waveform by charging / discharging the element; and a plurality of the power supply capacitance elements connected to a DC power supply via the first inductance element. A charging current control capacitance element for controlling a charging current to the power conversion device, and charging / discharging means for charging / discharging the charging current control capacitance element, wherein the control means includes the power supply capacitance element When the predetermined voltage is charged, the charging current control capacitance element and the DC power supply are connected in series in the charging path of the power supply capacitance element so that the DC power supply and the DC power supply have opposite polarities. It is characterized by being connected.

According to the second aspect of the present invention, the control means controls the charging current control capacitance element and the charging path of the power supply capacitance element such that the charging current control capacitance element and the DC power supply have the same polarity. Connected in series to charge the power supply capacitance element to a power supply voltage or higher.

According to the third aspect of the present invention, the control means controls the charging current control capacitance element and the power supply capacitance element so that the charging current control capacitance element and the DC power supply have the same polarity. When the power supply capacitance element is charged to a power supply voltage or higher and the power supply capacitance element is charged with a substantially predetermined voltage, the charging current control capacitance element is connected to the power supply capacitance element by connecting in series. The charging path is removed from the charging path.

According to the fourth aspect of the present invention, the control means arbitrarily connects a plurality of charging current controlling capacitance elements in series, and the series circuit of the charging current controlling capacitance elements and the DC power supply are the same. By connecting the charging current control capacitance element in series in the charging path of the power supply capacitance element so that it becomes a polarity, the power supply capacitance element is charged to a power supply voltage or more and the power supply capacitance element is substantially connected to the power supply capacitance element. When the predetermined voltage is charged, the charging current control capacitance element and the DC power supply are connected in series in the charging path of the power supply capacitance element such that the charging current control capacitance element and the DC power supply have opposite polarities. It is characterized by the following.

According to the fifth aspect of the present invention, the control means arbitrarily connects a plurality of charging current controlling capacitance elements in series, and the series circuit of the charging current controlling capacitance elements and the DC power supply are the same. By connecting the charging current control capacitance element in series in the charging path of the power supply capacitance element so that it becomes a polarity, the power supply capacitance element is charged to a power supply voltage or more and the power supply capacitance element is substantially connected to the power supply capacitance element. When the predetermined voltage is charged, the charging current control capacitance element is removed from the charging path of the power supply capacitance element.

According to the invention described in claim 6, the control means charges the plurality of charging current control capacitance elements to mutually different voltages, and sets a predetermined voltage of the power supply capacitance element, a DC power supply, and an arbitrary number. In order to reduce the potential difference from the sum of the charging voltages of the charging current control capacitance elements, the charging current control capacitance element is connected in series with the DC power supply in the charging path of the power supply capacitance element. It is characterized by that.

According to the seventh aspect of the present invention, the first inductance element charges the plurality of power supply capacitance elements to voltages different from each other and higher than the power supply voltage.
It is characterized in that the inductance changes.

According to the eighth aspect of the present invention, the first inductance control switching element connected in series with the first inductance element, and the first inductance element and the first inductance control switching element are connected in series. An inductance circuit in which circuits are connected in parallel is provided, and the inductance of the first inductance element is changed by arbitrarily opening and closing each of the plurality of first inductance control switching elements.

According to the ninth aspect of the present invention, the second inductance control switching element connected in parallel with the first inductance element and the parallel circuit of the second inductance element and the inductance control switching element are connected in series. With the connected inductance circuit,
The inductance of the first inductance element is changed by arbitrarily opening and closing each of the plurality of switching elements for inductance control.

According to a tenth aspect of the present invention, the load is a discharge lamp.

[0016]

According to the first aspect of the present invention, the charging element for charging current control is charged from the DC power supply via the first inductance element. On the other hand, after charging the plurality of power supply capacitance elements to predetermined mutually different voltages, the charge current control capacitance elements and the DC power supply are supplied with the charge current control capacitance elements so that the polarities thereof are opposite to each other. Connected in series in the charging path of the capacitance element for use. Then, the charging current to the power supply capacitance element rapidly decreases.

According to the second aspect of the present invention, the charging element for charging current control is charged from the DC power supply via the first inductance element. Thereafter, the charging current control capacitance element is connected in series in the charging path of the power supply capacitance element such that the charging current control capacitance element and the DC power supply have the same polarity.
Then, the plurality of power supply capacitance elements are charged up to the power supply voltage and to predetermined voltages different from each other.

According to the third aspect of the present invention, the charging element for charging current control is charged from the DC power supply via the first inductance element. Thereafter, the charging current control capacitance element is connected in series in the charging path of the power supply capacitance element such that the charging current control capacitance element and the DC power supply have the same polarity.
Then, after charging the plurality of power supply capacitance elements to a predetermined voltage which is higher than the power supply voltage and different from each other, the charge current control capacitance element is removed from the charging path of the power supply capacitance element. The charging current to the element decreases rapidly.

According to the fourth aspect of the present invention, the plurality of charging current controlling capacitance elements are charged from the DC power supply via the first inductance element. Thereafter, an arbitrary number of the charging current control capacitance elements are connected in series in the charging path of the power supply capacitance element such that the arbitrary number of the charging current control capacitance elements and the DC power supply have the same polarity. . Then, after charging the plurality of capacitance elements for power supply to a predetermined voltage different from or higher than the power supply voltage, at least one of the capacitance elements for charging current control and the DC power supply have opposite polarities. When connected in series in the charging path of the capacitance element, the charging current to the power supply capacitance element sharply decreases.

According to the fifth aspect of the present invention, the plurality of charging current controlling capacitance elements are charged from the DC power supply via the first inductance element. Thereafter, an arbitrary number of the charging current control capacitance elements are connected in series in the charging path of the power supply capacitance element such that the arbitrary number of the charging current control capacitance elements and the DC power supply have the same polarity. . Then, after charging the plurality of power supply capacitance elements to a predetermined voltage that is equal to or higher than the power supply voltage and is different from each other, if at least one charging current control capacitance element is removed from the charging path of the power supply capacitance element, the power supply The charging current to the supply capacitance element rapidly decreases.

According to the sixth aspect of the invention, the plurality of charging current controlling capacitance elements are charged from the DC power supply via the first inductance element. Thereafter, an arbitrary number of the charging current control capacitance elements are connected in series in the charging path of the power supply capacitance element such that the arbitrary number of the charging current control capacitance elements and the DC power supply have the same polarity. . In this case, the difference between the sum of the voltages of the DC power supply and any number of the charging current control capacitance elements and the voltage of the charged power supply capacitance element is set to be small.

According to the seventh aspect of the invention, the value of the first inductance element is reduced, and the power supply capacitance element is charged to a lower voltage from the DC power supply via the first inductance element. On the other hand, the value of the first inductance element is increased, and the power supply capacitance element is charged to a high voltage from the DC power supply via the first inductance element.

According to the invention, the value of the first inductance element is changed by controlling the first inductance control switching element.

According to the ninth aspect of the present invention, the value of the first inductance element is changed by controlling the second inductance control switching element.

According to the tenth aspect of the present invention, the discharge lamp is stably lit by supplying AC high-frequency power to the discharge lamp.

[0026]

【Example】

(Embodiment 1) A circuit diagram of a first embodiment according to the present invention is shown in FIG. 1, and an operation explanatory diagram thereof is shown in FIG.

The difference from the conventional example shown in FIGS.
Switching element S_S, Diode D_SInstead of
Capacitance element C₁~ C_FiveGround terminal and DC power
A switching element connected in series with the negative terminal of the source E;
Child S_S2And the inductance element L₁DC power supply E via
Switching element S connected in parallel to both ends of_S5, Capacity
Citance element C_SSeries circuit consisting of
Element C_S, Switching element S_S2Reverse at both ends of the series circuit
Diode D connected in parallel_S1And provide
Pacitance element C₁~ C_FiveCharged during charging
Citance element C _STo the inductance element L₁, Capacity
By inserting in series with the resonance circuit composed of the
Vibration current suddenly decreases to zero, and switches at zero cross.
Ching element S_S2Turn off other legacy
The description of the same components as in the example is omitted by giving the same reference numerals.
I do. The capacitance element C₁~ C_FiveVoltage V_C1
~ V_C5Is lower than or almost equal to DC power source E.
You.

Next, the operation will be briefly described with reference to FIG.
You. Time t₀By the capacitance element C_SAnd Daio
-D_S1The connection point A to
Element C_SVoltage V_CSIs charged to the initial voltage value.
And Time t₀Switching element S₅₁ , S_S2The
When the DC power supply E₁Through
And the capacitance element C_FiveCharge. At this time,
Style I₁Is the inductance element L₁And capacitance element
Child C_FiveResonantly flows with the time constant of Capacitance element
Child C_FiveVoltage V_C5At which the voltage almost reaches the set voltage
t₁Switching element S_S2Is turned off, the DC power supply E
From the inductance element L₁Through the capacitance element
Child C_Five, C_SIs charged. At this time,
Pacitance element C_Five, C_SSeries capacitance and inductance
Element L₁Resonates with the time constant of₁
And E <V _C5+ V_CSCapacity to be
Cance element C_SVoltage V_CSIs set, the current I₁
Decreases sharply at time t_TwoAnd becomes zero. And time
t_TwoAnd switching element S₅₁Turn off. Time t_ThreeNisu
Switching element S₄₁Is turned on, the DC power supply E
Ductance element L₁Via the capacitance element C_FourTo
Charge. At this time, the current I₁Is an inductance element
L₁And capacitance element C_FourWith a time constant of
It is. Time t_FourCapacitance element C_FourVoltage V
_C4Reaches almost the set voltage, the time t₁alike,
Switching element S_S2To turn off the capacitance element C
_SIs the current I₁And E <V_c4+ V _cs
So that the capacitance element C_SVoltage V_csTo
When set, the current I₁Decreases sharply at time t_FiveAt zero
become. And time t_FiveAnd switching element S₄₁The
Off. Capacitance element C₁~ C_ThreeIn the
Pacitance element C_Four, C_FiveThe same operation as is performed.

The voltage across V _CS here capacitance element C _s is the charging is completed the time t ₁₄ of the capacitance element C _1, so is higher than the initial value at time t _0, at the time t ₁₅ Turn on the switching element S _S5 ,
Reset capacitance element C _S by returning the power to the DC power supply E through the inductance element L _1.

With the above configuration, high speed and high speed
Capacitance element C for efficiency₁~ C _FiveTo the set voltage
Can be charged.

(Embodiment 2) FIG. 3 is a circuit diagram of a second embodiment according to the present invention, and FIG. 4 is a diagram illustrating the operation thereof.

The difference from the first embodiment shown in FIGS. 1 and 2 is that a switching element S _S4 and a capacitance element C _S are newly added between one end of the capacitance element C _S and the ground terminal of the DC power source E. Diode D _S2 for preventing current backflow
And a switching element S _S3 is connected between the diode D _S1 for preventing current backflow of the capacitance element C _S and the connection point A, and between the connection point A and the diode D _S2. with connecting switching elements S _S1, the capacitance element C _S polarity opposite can charge the capacitance element C ₁ -C ₅ by inserting in the current path to a voltage higher than the power supply voltage, and a capacitance element C _S It shares a capacitance element C that sharply reduces the resonance current, and the same components as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

Next, the operation will be briefly described with reference to FIG. In the present embodiment, since the operation in the case of normal charging and when charging the capacitance element C ₅ to a high voltage are different, each of them will be described.

[0034] First, for example, will be described when charging the capacitance element C ₅ to a high voltage.

[0035] to time t _0, the voltage across V _CS capacitance element C _S is assumed to be charged to the initial voltage node A as positive potential.

At time t ₀ , the switching elements S _S1 , S _S2 ,
When _S51 is turned on, DC power supply E → inductance element L
₁ → Capacitance element C ₅ → Switching element S _S2 →
Capacitance element C _S → switching element S _S1 → E + V _{CS in} the path of DC power supply E and capacitance element C ₅
To a high voltage. At time t ₁ when the capacitance element C ₅ is charged to almost the set voltage, the switching element S
_S4 is turned on, turns on the switching element S _S3 to time t _2, the
The switching element S _S1 is turned off. Then, the switching element S _S2 is turned off at the time t ₃ , and the capacitance element C _S is inserted into the current path in a polarity opposite to that of the time t _{0 to} t ₁ , thereby obtaining the current I as shown in FIG. ₁ abruptly reduces to disconnect the capacitance element C ₅ from the charging path by turning off the switching element S ₅₁ at time t ₄ when zero. As shown in FIG. 4 (g), when charging the capacitance element C ₅ (time t ₀ ~t ₁₎ is lowered voltage across V _CS capacitance element C _S, the time t ₃ ~t ₄ is a DC power source E voltage across V _CS capacitance element C _S by the charging from the serves to compensate for the voltage drop during discharge rises.

Next, the capacitance element C_TwoThe normal charge
Will be described. DC power supply E to capacitor
Element C_TwoIs directly charged, and the capacitance element C _Twoof
When the voltage approaches the set voltage, the capacitance element C_STo
Capacitance element C_TwoAnd the current I₁Suddenly
Decrease sharply. Specifically, time t_FourSwitching element
Child S_S2 , S_S4 , S_{twenty one}Turn on the DC power supply E → inductor
Sensing element L₁→ Capacitance element C_Two→ Switching
Element S_S2→ Switching element S_S4→ Diode D_S2→ direct
In the path of the power supply E, the capacitance element C_TwoCharge.
Current I ₁Is rapidly reduced when the switching element S
_S3Turn on the switching element S_S2By turning off
Capacitance element C_STo the capacitance element C_TwoDirectly
Connect columns.

With the above configuration, the capacitance elements C _{1 to} C ₅ can be charged to a high voltage.
For example, when the load Z is a discharge lamp load, if it is necessary to increase the load voltage at the time of dimming or the like, the capacitance elements C ₁ to
It can be stably lighted by increasing the voltage of the C _5.

[0039] Note that during charging of the high voltage of the capacitance element C ₁ -C ₅ decreases the voltage of the capacitance element C _S, the voltage across V _CS capacitance element C _S when reducing the current I ₁ rises rapidly to order, charge and discharge amount between the in the DC power source E to the time for resetting the voltage across V _CS capacitance element C _S ends the operation of one cycle and the capacitance element C _S is reduced.

(Embodiment 3) FIG. 5 shows a circuit diagram of a third embodiment according to the present invention.

The difference from the second embodiment shown in FIG. 3 is that the current control section b is formed by omitting the current backflow prevention diode D _S1 of the switching elements S _S2 and S _S3 and the capacitance element C _S , omitted in order to reduce the current I ₁ flowing through the element L ₁ abruptly, is to eliminate the capacitance element C _S from the current path, a description by the same numerals are assigned to the same configuration as the other of the second embodiment .

Next, the operation will be briefly described. When charging the capacitance elements C _{1 to} C ₅ to a high voltage, the switching element S _S1 is turned on and the switching element S _S4 is turned off, so that the capacitance element C _{S is connected} to the DC power supply E.
Connected in series for charging the capacitance element C ₁ -C ₅ to. Turn on the switching element S _S4 when the capacitance element C ₁ -C ₅ is charged to approximately the set voltage, by turning off the switching element S _S1, the capacitance element a supply voltage disconnect the capacitance element C _S from the current path C current I by lower than the voltage of ₁ -C ₅
Decrease ₁ sharply.

(Embodiment 4) FIG. 6 shows a circuit diagram of a fourth embodiment according to the present invention.

The difference from the third embodiment shown in FIG. 5 is that the current control section b is provided with j (j = 1 to n) and connected in series to the power supply in accordance with the set voltages of the capacitance elements C _{1 to} C _5. it is is to charge the capacitance element C ₁ -C ₅ by changing the number of current control capacitance element C _Sj that, the same components as other third embodiment will be omitted by retaining the same reference numerals.

Next, the operation will be briefly described. Capacitor
Element C₁~ C_FiveVoltage V at the end of charging₁~ V_Five
Is not less than mE and not more than (m + 1) E (m = 1 to j),
M capacitance elements C in series with DC power supply E_SDirectly
By connecting in columns, the capacitance element C₁~ C_Five
Charge. Capacitance element C₁~ C_FiveVoltage across
V_C1~ V_C5Is almost set voltage V ₁~ V_FiveWhen it comes to
Citance element C_Sj(J = 1 to n)
Remove from flow path or reverse polarity.

[0046] As are charged from the respective capacitance elements C _S is the DC power source E to the DC power source E via the inductance element L _1, for example, when the setting voltage V ₅ of the capacitance element C ₅ is more 4E less 3E, DC 3 for power supply E
E + 4V by connecting the capacitance elements _CS in series
Charging the capacitance element C _S in _CS = 4E. When charging the capacitance element C ₅ to approximately a predetermined voltage, disconnect the current path of at least one capacitance element C _S, by applying 3E to the capacitance element C _5, 3E <V _C <5E, and the charging current abruptly To decrease. Similarly, the other capacitance elements C _{1 to} C ₄ rapidly decrease the charging current.

With the above configuration, the capacitance elements C _{1 to} C ₅ can be charged with a very high voltage of j + 1 (j = 1 to n) times the power supply voltage E, and the DC power supply E and the capacitance element can be charged. Since the difference voltage between the series voltage of C _Sj and the set voltages V _{1 to} V ₅ can be reduced, the current peak can be reduced and the circuit efficiency can be improved.

[0048] Incidentally, in advance to set the initial voltage of different capacitance element C _S, in accordance with the set voltage V ₁ ~V ₅ of capacitance elements C ₁ ~ capacitance element C _5, the current control to be connected in series to a DC power source E with selecting use capacitance element C _S, other capacitance element C _S is previously removed from the current path, a DC power source E, to reduce the difference voltage between the series voltage of the capacitance element C _Sj the set voltage V ₁ ~V ₅ It may operate in the following manner.

(Embodiment 5) FIG. 7 shows a circuit diagram of a fifth embodiment according to the present invention.

The difference from the second embodiment shown in FIG.
Conductance element L₁Switching element SL in series with₁
And the inductance element L₁And switching elements
SL ₁In parallel with the series circuit of_Three
(> Inductance element L₁) And switching element SL
_TwoAnd a series circuit with
Switching element SL₁ON, switching element SL_Two
Switch off during charging operation to high voltage
Element SL₁Off, switching element SL_TwoTurn on
Inductance element L₁, L_ThreeIs to switch
The same components as those of the second embodiment are denoted by the same reference numerals.
Thus, the description is omitted.

(Embodiment 6) FIG. 8 is a circuit diagram of a sixth embodiment according to the present invention.

The difference from the fifth embodiment shown in FIG. 7 is that the inductance elements L ₁ and L ₃ are connected in series, and the switching element SL ₁ is provided at both ends of the inductance element L _3.
Are connected in parallel, and the switching element SL
To reduce inductance _by-one, and at the time of charging the high voltage is to use a large inductance element and turns off the switching elements SL _1, the same numerals are assigned to the same configuration as the other of the fifth embodiment Thus, the description is omitted.

In the fifth and sixth embodiments,
During the charging operation to a high voltage, the difference voltage between the series voltage of the DC power supply E and the capacitance element C _Sj and the set voltages V _{1 to} V ₅ increases, so that the current peak is suppressed by changing the inductance, Efficiency can be improved.

[0054]

According to the first to fifth aspects of the present invention, each of the capacitance elements can be charged to an arbitrary voltage at a high speed, the switching elements are prevented from deteriorating, and a switched capacitor with little input distortion is used. Power conversion device can be provided.

According to the sixth aspect of the present invention, there is provided a switched capacitor which can charge each capacitance element to an arbitrary voltage at high speed, prevents deterioration of the switching element, has high circuit efficiency, and has little input distortion. The used power converter can be provided.

According to the seventh to ninth aspects of the present invention, each capacitance element can be charged to an arbitrary voltage at a high speed, the switching element is prevented from deteriorating, the input distortion is reduced, and the power using the switched capacitor is reduced. A conversion device can be provided.

According to the tenth aspect of the present invention, a switched capacitor capable of charging each capacitance element to an arbitrary voltage at high speed, preventing deterioration of the switching element, reducing input distortion, and stably lighting a discharge lamp. Can be provided.

[Brief description of the drawings]

FIG. 1 shows a circuit diagram of a first embodiment according to the present invention.

FIG. 2 is an operation waveform diagram according to the embodiment.

FIG. 3 shows a circuit diagram of a second embodiment according to the present invention.

FIG. 4 is an operation waveform diagram according to the embodiment.

FIG. 5 shows a circuit diagram of a third embodiment according to the present invention.

FIG. 6 shows a circuit diagram of a fourth embodiment according to the present invention.

FIG. 7 shows a circuit diagram of a fifth embodiment according to the present invention.

FIG. 8 shows a circuit diagram of a sixth embodiment according to the present invention.

FIG. 9 shows a circuit diagram of a conventional example according to the present invention.

FIG. 10 shows an operation waveform diagram according to the above conventional example.

[Explanation of symbols]

 C capacitance element I current L inductance element S switching element V voltage Z load

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02M 7/48

Claims (10)

(57) [Claims] 1. A load, a plurality of power supply capacitance elements, a first inductance element connected to a DC power supply, and substantially predetermined power supply capacitance elements via the first inductance element. Charging means for charging the load , a load capacitance element connected in parallel to the load , a second inductance element connected in series to a parallel circuit of the load and the load capacitance element, and the parallel circuit And a plurality of switching elements connected in series between the series circuit including the second inductance element and the plurality of power supply capacitance elements, and alternatively switching the plurality of power supply capacitance elements. the connected in series circuit the
The load capacitor via the inductance element
Control means for changing the voltage across the load capacitance element in a substantially pulsating waveform by charging / discharging the capacitance element; and connecting the plurality of power supply capacitances to the DC power supply via the first inductance element. A power conversion device comprising: a charging current control capacitance element that controls a charging current to an element; and a charge / discharge unit that charges / discharges the charge current control capacitance element. The control unit includes the power supply capacitance. When the element is charged with a substantially predetermined voltage, the charging current control capacitance element and the DC power supply have opposite polarities, and the charging current control capacitance element is placed in the charging path of the power supply capacitance element. A power converter characterized by being connected in series. 2. The control means according to claim 1, wherein said charging current control capacitance element and said DC power supply have the same polarity so that said charging current control capacitance element and said DC power supply have the same polarity. A power converter, wherein the power supply capacitance element is charged to a power supply voltage or higher by connecting in series in a charging path of the power supply capacitance element. 3. The control unit according to claim 1, wherein the charging current control capacitance element and the power supply capacitance element are charged so that the charging current control capacitance element and the DC power supply have the same polarity. By connecting in series in the path, the power supply capacitance element is charged to a power supply voltage or higher, and when the power supply capacitance element is charged with a substantially predetermined voltage, the charging current control capacitance element is connected to the power supply capacitance element. A power conversion device, wherein the power conversion device is excluded from a charging path of a power supply capacitance element. 4. The control means according to claim 1, wherein a plurality of said plurality of charging current controlling capacitance elements are arbitrarily connected in series, and a series circuit of said charging current controlling capacitance elements and a DC power supply are the same. By connecting the charging current control capacitance element in series in the charging path of the power supply capacitance element so as to have a polarity, the power supply capacitance element is charged to a power supply voltage or more, and the power supply When the capacitance element is charged with a substantially predetermined voltage, the charging current control capacitance element and the DC power supply have opposite polarities so that the charging current control capacitance element is in the charging path of the power supply capacitance element. A power converter, wherein the power converter is connected in series. 5. The control means according to claim 1, wherein a plurality of said plurality of charging current controlling capacitance elements are arbitrarily connected in series, and a series circuit of said charging current controlling capacitance elements and a DC power supply are the same. By connecting the charging current control capacitance element in series in the charging path of the power supply capacitance element so as to have a polarity, the power supply capacitance element is charged to a power supply voltage or more, and the power supply A power converter, wherein when the capacitance element is charged with a substantially predetermined voltage, the charging current control capacitance element is removed from a charging path of the power supply capacitance element. 6. The control means according to claim 1, wherein said plurality of charging current control capacitance elements are charged to different voltages, a predetermined voltage of said power supply capacitance element, a DC power supply, and said arbitrary power supply. In order to reduce the potential difference from the sum of the charging voltages of the number of charging current control capacitance elements, the same polarity as the DC power supply, and the charging current control capacitance elements are placed in the charging path of the power supply capacitance elements. A power converter characterized by being connected in series. 7. The first inductance element, wherein the inductance changes so that the plurality of power supply capacitance elements are charged to voltages different from or above a power supply voltage different from each other. The power converter according to any one of the preceding claims. 8. A first inductance control switching element connected in series with the first inductance element, and a series circuit of the first inductance element and the first inductance control switching element are connected in parallel. 8. The electric power according to claim 7, wherein an inductance circuit is provided, and the inductance of the first inductance element is changed by arbitrarily opening and closing each of the plurality of first inductance control switching elements. Conversion device. 9. A second inductance control switching element connected in parallel with the first inductance element, and an inductance circuit in which a parallel circuit of the second inductance element and the inductance control switching element is connected in series. 8. The power converter according to claim 7, wherein the inductance of the first inductance element is changed by arbitrarily opening and closing each of the plurality of inductance control switching elements. 10. The power converter according to claim 1, wherein the load is a discharge lamp.